As others have said, just use common sense with the lights and do not operate them on the street unless in a parade. I live in a state where its illegal to even have red lights facing to the front, even of they are not hooked up, and I have never been pulled over having them on my cars in the 25 years Ive done so, and I use mine as daily drivers, so they have lots of opportunity to see one of my cars out and about. Even the purple lightbars or dash lights is a no no here unless you are a licensed funeral home and have a permit to use them, and so far I have never had an issue.
The only one I have not tried yet is for my 49 combo I want to install the red lenses that are in the turn signal location, and get rid of the bumper mounted red lights, but everytime I hit the turn signal it would flash red to the front. Im pretty sure that will be an issue, but not sure how to get away with that one yet.
As for the skeleton rack, they are not too hard to come across, they still make them new, and Im not sure how much the design has changed over the years, so may be easy to spot compared to a period correct one.